11561090940 has 144 divisors (see below), whose sum is σ = 41010697728. Its totient is φ = 2581068672.

The previous prime is 11561090939. The next prime is 11561090963. The reversal of 11561090940 is 4909016511.

11561090940 is a `hidden beast` number, since 1 + 1 + 561 + 0 + 9 + 0 + 94 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 11561090895 and 11561090904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 52512 + ... + 160871.

It is an arithmetic number, because the mean of its divisors is an integer number (284796512).

Almost surely, 2^11561090940 is an apocalyptic number.

11561090940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11561090940 is an abundant number, since it is smaller than the sum of its proper divisors (29449606788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11561090940 is a wasteful number, since it uses less digits than its factorization.

11561090940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213448 (or 213443 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The spelling of 11561090940 in words is "eleven billion, five hundred sixty-one million, ninety thousand, nine hundred forty".